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Date:      Fri, 5 Sep 2003 19:19:15 +0300
From:      Peter Pentchev <roam@ringlet.net>
To:        Glen Gibb <grg@ridley.unimelb.edu.au>
Cc:        bug-followup@FreeBSD.org
Subject:   Re: docs/56021: Documentation incorrect for mac in ipfw2
Message-ID:  <20030905161915.GG556@straylight.oblivion.bg>
In-Reply-To: <200308270107.h7R17L23047514@genesis.ridley.unimelb.edu.au>
References:  <200308270107.h7R17L23047514@genesis.ridley.unimelb.edu.au>

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On Wed, Aug 27, 2003 at 11:07:21AM +1000, Glen Gibb wrote:
> 
> >Number:         56021
> >Category:       docs
> >Synopsis:       Documentation incorrect for mac in ipfw2
> >Originator:     Glen Gibb
> >Release:        FreeBSD 5.1-CURRENT i386
[snip]
> >Description:
> 
> The man page for ipfw (IPFW2) is incomplete/misleading in regards to
> the "mac" option in the RULE OPTIONS section. 
> 
> The man page states that the address can be "optionally followed by a
> mask indicating how many bits are significant, as in MAC
> 10:20:30:40:50:60/33 any". This IS correct but it does not mention the
> second method of specifying a bit mask, that is by following the
> address with an ampersand (&) followed by the bitmask whcich is
> specified using the same format as the address. For example, if we
> wanted to match any mac address that ended with 60, we could use the
> following mask:
> 
> MAC 00:00:00:00:50:60&00:00:00:00:00:ff

What do you think about the following patch?

G'luck,
Peter

-- 
Peter Pentchev	roam@ringlet.net    roam@sbnd.net    roam@FreeBSD.org
PGP key:	http://people.FreeBSD.org/~roam/roam.key.asc
Key fingerprint	FDBA FD79 C26F 3C51 C95E  DF9E ED18 B68D 1619 4553
This sentence was in the past tense.

Index: src/sbin/ipfw/ipfw.8
===================================================================
RCS file: /home/ncvs/src/sbin/ipfw/ipfw.8,v
retrieving revision 1.131
diff -u -r1.131 ipfw.8
--- src/sbin/ipfw/ipfw.8	22 Jul 2003 07:41:24 -0000	1.131
+++ src/sbin/ipfw/ipfw.8	5 Sep 2003 16:12:41 -0000
@@ -1046,11 +1046,31 @@
 .Cm any
 keyword (matching any MAC address), or six groups of hex digits
 separated by colons,
-and optionally followed by a mask indicating how many bits are
-significant, as in
+and optionally followed by a mask indicating the significant bits.
+The mask may be specified using either of the following methods:
+.Bl -enum -width indent
+.It
+A slash
+.Pq /
+followed by the number of significant bits.
+For example, an address with 33 significant bits could be specified as:
 .Pp
 .Dl "MAC 10:20:30:40:50:60/33 any"
 .Pp
+.It
+An ampersand
+.Pq &
+followed by a bitmask specified as six groups of hex digits separated
+by colons.
+For example, an address in which the last 16 bits are significant could
+be specified as:
+.Pp
+.Dl "MAC 10:20:30:40:50:60&00:00:00:00:00:ff any"
+.Pp
+Note that the ampersand character has a special meaning in many shells
+and should generally be escaped.
+.Pp
+.El
 Note that the order of MAC addresses (destination first,
 source second) is
 the same as on the wire, but the opposite of the one used for



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